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Love it! Mine has developed a bit of dial texture like yours and I like it! How did you go about dating yours? I’m keen to narrow that down on mine
With Bulova, and a few of the other popular American brands of the time like Timex, the date is on the case back, a letter for decade, followed by a single numeral for the year…
Edit: actually, on these, it’s on the inside of the case back:
M = 196x , M5 = 1965